diff --git a/gui.py b/gui.py
index 3946d56..208553c 100644
--- a/gui.py
+++ b/gui.py
@@ -1,8 +1,9 @@
 import sys
-from tkinter import Frame, Label, Tk
+from tkinter import Button, Frame, Label, Tk
+from tkinter.filedialog import askdirectory, askopenfile
 
 from src.clangformat import clang_format, parse_clang_format_output
-from src.utils import analyze_args
+from src.utils import analyze_args, exts_list
 
 
 class GUI:
@@ -15,7 +16,6 @@ class GUI:
     def start(self) -> None:
         """Affiche la fenêtre"""
         self._main_screen()
-        self.f.grid()
         # self.change_pos(1280, 720)
         self.parent.title(self.name)
         self.parent.mainloop()
@@ -31,28 +31,72 @@ class GUI:
 
         self.parent.geometry(f"{x}x{y}+{x_i}+{y_i}")
 
+    def _open_file(self):
+        try:
+            chemin = askopenfile(
+                title=f"Choisir un fichier - {self.name}",
+                filetypes=[("Tous les fichiers", "*")]
+                + [
+                    (langage, f"*.{ext}")
+                    for langage, exts in exts_list.items()
+                    for ext in exts
+                ],
+            )
+        except AttributeError:
+            print("Impossible de trouver le fichier", file=sys.stderr)
+            exit(1)
+        else:
+            if chemin:
+                return self._analyse(2, chemin.name)
+
+    def _open_directory(self):
+        try:
+            chemin = askdirectory()
+        except AttributeError:
+            print("Impossible de trouver le dossier", file=sys.stderr)
+            exit(1)
+        else:
+            return self._analyse(2, chemin)
+
     def _main_screen(self):
         """Écran principal"""
         Label(
             self.parent,
             text=f"{self.name} est une application qui permet d'utiliser "
             "plus facilement clang-format",
-        ).grid(column=0, row=0, columnspan=1)
-        self._analyse()
+        ).grid(column=0, row=0, rowspan=2)
 
-    def _analyse(self) -> None:
+        Button(self.parent, text="Ouvrir un fichier", command=self._open_file).grid(
+            column=1, row=0
+        )
+        Button(
+            self.parent, text="Ouvrir un dossier", command=self._open_directory
+        ).grid(column=1, row=1)
+
+    def _analyse(self, start_row: int, path: str) -> None:
         """Analyse les données"""
-        files = analyze_args(sys.argv[1:])
+
+        self.f.destroy()
+        self.f = Frame(self.parent)
+        self.f.grid()
+
+        files = analyze_args([path])
+        idx = start_row
         for file in files:
             clang_format_output = clang_format(file)
             parsed_output = parse_clang_format_output(clang_format_output)
 
             if parsed_output:
-                for idx, error in enumerate(parsed_output):
+                for error in parsed_output:
                     Label(
                         self.parent,
                         text=f"Avertissement dans {error.filename} "
                         f"à la ligne {error.line_number}, caractère {error.column_number}.",
-                    ).grid(column=0, row=idx + 1, columnspan=1)
+                    ).grid(column=0, row=idx, columnspan=1)
+                    idx += 1
             else:
-                print(f"Aucun avertissement trouvé dans {file}.")
+                Label(
+                    self.parent,
+                    text=f"Aucun avertissement trouvé dans {file}.",
+                ).grid(column=0, row=idx, columnspan=1)
+                idx += 1
diff --git a/src/utils.py b/src/utils.py
index a925570..fe761f9 100644
--- a/src/utils.py
+++ b/src/utils.py
@@ -1,6 +1,20 @@
 import os
 import sys
 
+exts_list = {
+    "CSharp": ["cs"],
+    "Java": ["java"],
+    "JavaScript": ["mjs", "js", "ts"],
+    "Json": ["json"],
+    "Objective-C": ["m", "mm"],
+    "Proto": ["proto", "protodevel"],
+    "TableGen": ["td"],
+    "TextProto": ["textpb", "pb.txt", "textproto", "asciipb"],
+    "Verilog": ["sv", "svh", "v", "vh"],
+    "C": ["c"],
+    "C++": ["cpp"],
+}
+
 
 def analyze_args(args: list) -> list[str]:
     """Renvoie la liste des fichiers"""
@@ -33,29 +47,7 @@ def check_ext(filename: str) -> bool:
     supported_exts = tuple(
         map(
             lambda ext: "." + ext,
-            [
-                "cs",
-                "java",
-                "mjs",
-                "js",
-                "ts",
-                "json",
-                "m",
-                "mm",
-                "proto",
-                "protodevel",
-                "td",
-                "textpb",
-                "pb.txt",
-                "textproto",
-                "asciipb",
-                "sv",
-                "svh",
-                "v",
-                "vh",
-                "c",
-                "cpp",
-            ],
+            [ext for exts in exts_list.values() for ext in exts],
         )
     )